The project consists of vegetating and dewatering the floors of the Place de l'Hôtel de Ville and Rue Jean Jaurès, located in the municipality of Roanne (42). The main objective of the operation is to adapt to global warming, improve the comfort of inhabitants, anticipate the risks of natural disasters and promote biodiversity in cities. The development carried out is part of an ecosystem-based approach: vegetation, infiltration of water into the soil and evapotranspiration of plants.